3 in 1 vaccine- feline focus

Anyone know why the Feline focus vaccine- 3 is out of stock?  Did the manufacturers stop making it for some reason?

I usually use the feline focus vaccine as that one is not an injectable. The injectable has been associated with kidney failure so I prefer to use the intranasal. Only I can't find it anywhere!

I' ve actually never heard of this vaccine, but am wondering if you could just call the manufacturer and ask them about it.